Remove signin and persist from gaia_authenticator.

chrome/browser/sync/util/user_settings.h

Index: chrome/browser/sync/util/user_settings.h
diff --git a/chrome/browser/sync/util/user_settings.h b/chrome/browser/sync/util/user_settings.h
index e379cc03307394056feec2f3a8415de7b6507d1f..7bfa5712bfdee7b9541faa8aa6e35a01782ba8ad 100644
--- a/chrome/browser/sync/util/user_settings.h
+++ b/chrome/browser/sync/util/user_settings.h
@@ -13,7 +13,6 @@
 #include "base/lock.h"
 #include "build/build_config.h"
 #include "chrome/browser/sync/util/sync_types.h"
-#include "chrome/common/net/gaia/signin.h"
 
 extern "C" struct sqlite3;
 
@@ -59,10 +58,6 @@ class UserSettings {
                                   std::string* username,
                                   std::string* service_token);
 
-  void RememberSigninType(const std::string& signin, gaia::SignIn signin_type);
-  gaia::SignIn RecallSigninType(const std::string& signin,
-                                gaia::SignIn default_type);
-
   void RemoveAllGuestSettings();
 
   void StoreEmailForSignin(const std::string& signin,